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Thread: 2.5 na 110 starting issues

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  1. #1
    Join Date
    Feb 2007
    Location
    MD
    Posts
    208

    Default 2.5 na 110 starting issues

    Hey all, I'm settling into my new "daily driver". It's an early 80's 110 with a naturally aspriated 2.5. Anyhow, I'm used to the cummins in my 109 which does not use any glow plugs and just fires right up every time. This 2.5 has a rough time on first start up for the day or when cold. Any suggestions on what to look for or check on the glow plug circuit. I do not see a light on the dash for the glow plugs so I'm thinking that might be the issue. If it's not the glow plugs what is the next most likely culprit. It starts up fine when warm. Is it also possible that it's just losing fuel pressure overnight?

    Any help would be appreciated.

  2. #2
    Join Date
    Dec 2007
    Location
    Golden CO
    Posts
    98

    Default

    Are you following proper starting procedure for this engine? I only ask because mine didn't come with a manual, so perhaps yours didn't either.

    When starting it from cold, first shift to neutral and do not touch either the clutch or the accelerator pedal. Rotate the key as though you are going to start, but stop short of actually engaging the starter. That should send 12v to the glow plugs, and should also actuate the yellow glow plug light. Mine is dim, and hard to see unless you are in very dim lighting.

    Hold the key in that position for a minumum of 10 seconds (more if it's really cold), and then crank with your feet remaining off both pedals.

    If that doesn't work, then make sure you are getting power to the glow plugs when you are holding the key in the glow plug position. If you are getting power, then perhaps the glow plugs need to be replaced.
    '55 SI 86

  3. #3
    Join Date
    Feb 2007
    Location
    MD
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    Default

    Thanks for the procedure. I don't have the manuals yet. I'll try that in the morning and see how it goes. I can't remember specifically if I've messed with the pedals but I can tell you I've let it go for longer that 30 seconds and still no joy.

  4. #4
    Join Date
    Dec 2007
    Location
    Golden CO
    Posts
    98

    Default

    In that case, and because you can't see the light at all, you're probably not getting power to your glow plugs.
    '55 SI 86

  5. #5
    Join Date
    Feb 2007
    Location
    MD
    Posts
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    Default

    Yeah, I think you may be right. I followed the procedure you described and it wasn't any better. The only light that comes on is the battery light. I'm presuming there is a separate light for the glow plugs.

  6. #6
    Join Date
    Dec 2007
    Location
    Golden CO
    Posts
    98

    Default

    Yes, it's yellow and has a choke symbol on it. You've got a wiring fault somewhere, possibly a fuse or relay.
    '55 SI 86

  7. #7
    Join Date
    Feb 2007
    Location
    MD
    Posts
    208

    Default

    Well, the glow plugs seem to be working fine. Might have been operator error. I wasn't turning the key far enough to activate the glow plugs.

  8. #8
    Join Date
    Apr 2008
    Location
    The Granite State (NH)
    Posts
    3,434

    Default

    2 things to note here:

    First, I ALWAYS use the heater plugs on any cold start, whether it's 80 degrees out or 20 degrees out. Heater plugs are $8 each to replace; A 2.5 diesel starter is $250 + to replace and the multiple 10-second cranks are killing it.

    Next, I'd recommend NGK Y208T heater plugs when the time comes to replace them. They're super-fast, compared to the originals. One of the best things I ever did for my 2.5.

    Good luck!
    --Mark

    1973 SIII 109 RHD 2.5NA Diesel

    0-54mph in just under 11.5 minutes
    (9.7 minutes now that she's a 3-door).

  9. #9
    Join Date
    Feb 2007
    Location
    MD
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    Default

    Thanks for the tip Mark. One more question. Is it normal to have to hold the key in position for the glow plugs to work? When I let go of the key it springs back and the light goes out.

  10. #10
    Join Date
    Apr 2008
    Location
    The Granite State (NH)
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    3,434

    Default

    Quote Originally Posted by slorocco View Post
    Thanks for the tip Mark. One more question. Is it normal to have to hold the key in position for the glow plugs to work? When I let go of the key it springs back and the light goes out.

    A question for somebody else, unfortunately--I don't have a diesel ignition switch, so I have to hold a separate switch and count one potato, two potato...


    I do know that some models of diesel rovers have a relay with a built-in timer, that once activated, will remain energized for so many seconds then automatically turn off, which is your cue to crank up the engine. Relay p/n PRC 6913. Thread on it here.
    --Mark

    1973 SIII 109 RHD 2.5NA Diesel

    0-54mph in just under 11.5 minutes
    (9.7 minutes now that she's a 3-door).

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